Non-isothermal crystallization and melting behavior of compatibilized polypropylene/recycled poly(ethylene terephthalate) blends

作者：Tao, Youji; Mai, Kancheng^*

来源：European Polymer Journal, 2007, 43(8): 3538-3549.

DOI：10.1016/j.eurpolymj.2007.05.007

• polypropylene
• recycled PET
• crystallization and melting behavior
• crystallization morphology
• interfacial interaction

Binary blends of polypropylene (PP)/recycled poly(ethylene terephthalate) (r-PET), r-PET/maleic anhydride grafted PP (PP-g-MA), r-PET/glycidyl methacrylate grafted PP (PP-g-GMA), and ternary blends of PP/r-PET (80/20 w/w) compat ibilized with various amounts (2-10 wt%) of PP-g-MA or PP-g-GMA were prepared on a twin-screw extruder. The nonisothermal crystallization and melting behavior, and the crystallization morphology were investigated by DSC and POM. The chemical reactions of r-PET with PP-g-MA and PP-g-GMA were characterized by FT-IR. DSC results show that the crystallization peak temperatures (T-c(p)) of r-PET and PP increased when blending them together, due to the heterogeneous nucleation effect on each other. The T-c(p) of r-PET increased with increasing the content of PP-g-MA while slightly influenced by the content of PP-g-GMA in the binary blends of r-PET with grafted PP, implying different reactivity of r-PET with PP-g-MA and PP-g-GMA. The T-c(p) of PP in the ternary blends retained or slightly decreased, dependent on the compatibilizers and their contents. The melting peak temperature (T-m(p)) of r-PET in PP/r-PET blends compatibilized M by PP-g-MA was lower than that of compatibilized by PP-g-GMA, indicating that PP-g-MA had stronger reactivity towards r-PET compared to PP-g-GMA. The crystallization and melting behavior of blends was influenced by the pre-melting temperature, especially the melting behavior of r-PET in the blends. The crystallization behavior of PP in the blends was also evaluated by Mo's method. POM confirmed the heterogeneous nucleation effect of r-PET on PP.

• 出版日期2007-8
• 单位中山大学